TANAIS LOKICATUS. 283 



The only specimen in the collection is imper- 

 fect. The first segment of the pereioii appears 

 to be imperfectly fused with the cephalon; in- 

 ferior antennaB scarcely half the length of the 

 superior. First pair of gnathopoda having the 

 propodos ovate ; dactylos short and tumid, shorter 

 and less pointed than the digital process of the 

 propodos. Pereiopoda having the first three 

 joints short and broad, being affixed to the side 

 of the pereion like plates of mail (hence the spe- 

 cific name) ; they terminate in short pointed 

 dactyli, and have the propodi armed with two 

 lateral rows of strong black pointed teeth. 



This species was taken from the hollow of a 

 sponge dredged in Esquimalt Harbour, at the 

 depth of about ten fathoms. 



IONE CORXUTUS, N. S. Mas: pleonem terminatum rotimde. 



The male differs from the description of the 

 European species, chiefly in having the caudal 

 extremity terminating obtusely, and in having 

 shorter antennae. 



Foem., subequilateralis, lateralia cornua cephalonis habens recur- 

 vata, pleopoda longa et arborea. 



The female has the antero-lateral hornlike pro- 

 cess of the cephalon curved posteriorly. The 

 pereion is not quite equilaterally developed. The 



